1/*
2 *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
3 *
4 *  Use of this source code is governed by a BSD-style license
5 *  that can be found in the LICENSE file in the root of the source
6 *  tree. An additional intellectual property rights grant can be found
7 *  in the file PATENTS.  All contributing project authors may
8 *  be found in the AUTHORS file in the root of the source tree.
9 */
10
11/******************************************************************
12
13 IiLBC Speech Coder ANSI-C Source Code
14
15 WebRtcIlbcfix_IndexConvEnc.c
16
17******************************************************************/
18
19#include "defines.h"
20/*----------------------------------------------------------------*
21 *  Convert the codebook indexes to make the search easier
22 *---------------------------------------------------------------*/
23
24void WebRtcIlbcfix_IndexConvEnc(
25    int16_t *index   /* (i/o) Codebook indexes */
26                                ){
27  int k;
28
29  for (k=4;k<6;k++) {
30    /* Readjust the second and third codebook index so that it is
31       packetized into 7 bits (before it was put in lag-wise the same
32       way as for the first codebook which uses 8 bits)
33    */
34    if ((index[k]>=108)&&(index[k]<172)) {
35      index[k]-=64;
36    } else if (index[k]>=236) {
37      index[k]-=128;
38    } else {
39      /* ERROR */
40    }
41  }
42}
43